\documentclass[a4paper,10pt]{article}
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\begin{document}

\begin{figure}[!h]
  \begin{center}
    \reflectbox{\includegraphics[width=0.5\textwidth]{../runs/rap6_run16_23_6_2.png}}
  \end{center}
  \caption{A picture of the same gull looking the other way!}
\end{figure}

\end{document}
